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Artin–Rees lemma : ウィキペディア英語版
Artin–Rees lemma
In mathematics, the Artin–Rees lemma is a basic result about modules over a Noetherian ring, along with results such as the Hilbert basis theorem. It was proved in the 1950s in independent works by the mathematicians Emil Artin and David Rees; a special case was known to Oscar Zariski prior to their work.
One consequence of the lemma is the Krull intersection theorem. The result is also used to prove the exactness property of completion .
==Statement ==
Let ''I'' be an ideal in a Noetherian ring ''R''; let ''M'' be a finitely generated ''R''-module and let ''N'' a submodule of ''M''. Then there exists an integer ''k'' ≥ 1 so that, for ''n'' ≥ ''k'',
:I^ M \cap N = I^ ((I^ M) \cap N).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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